Work,energy And Power

Question 1

What are the 4 energy stores

Answer 1

Gravitational
Mechanical
Nuclear
Electrical

Question 2

What are the energy transfers

Answer 2

Radiation
Electrically
Mechanically

Question 3

The principle of conservation of energy

Answer 3

Energy cannot be created or destroyed

Question 4

Work done =

Answer 4

Force x distance moved in the direction of the force

Question 5

What does the area under the force distance graph represent

Answer 5

Area = work done

Question 6

Whats the equation of energy stored in a spring

Answer 6

0.5 X force X extension

Question 7

Equation for Ek

Answer 7

0.5 X mass X velocity ^ 2

Question 8

Equation for Ep

Answer 8

Mass X gravitational constant X change in height

Question 9

How much energy is transferred from gravitational potential to kinetic energy

Answer 9

In a ideal system all energy is transferred however in reality some will be lost

Question 10

What is power

Answer 10

Rate of energy transferred

Question 11

Power equation

Answer 11

Change in energy /change in time

Question 12

How can power and work done be combined

Answer 12

Power = force x distance covered per second

Question 13

What is the equation for efficiency in relation to energy transferred

Answer 13

Efficiency = useful energy transferred by a machine/ energy supplied

Question 14

What is the equation for efficiency in relation to work done

Answer 14

Efficiency = work done by the machine / energy supplied to the machine

Question 15

Percentage efficiency equation

Answer 15

Percentage efficiency = (output of a machine /input of a machine ) *100